<!DOCTYPE html>
<html>
<head>
	<title>this闭包</title>
</head>
<body>
<script type="text/javascript">
	
var a = 10;
var use = {
	a: 5,
	ge: function() {
		return function() {
			console.log(this.a)
		}
	}
}
use.ge()();		// 此时this执行window,谁调用this就指向谁

</script>
</body>
</html>